This file contains the source code for Mike Johanson's count_nl_infosets package. It is written in C and released under the OpenBSD license. This is a simple tool for counting the number of game states, information sets, actions, and terminal nodes in large limit and no-limit Texas Hold'em and Royal Hold'em games. It requires the Gnu Multiple Precision Arithmetic Library, which it uses to obtain exact integer counts instead of using floating-point variables. The README file provides more detail, and both programs (count_nl_infosets and count_limit_infosets) provide usage information if run with no arguments. This package and its output is described in detail in the accompanying technical report.